I tend to watch and delete. It's unlikely you (or anyone?) will want to do what I do, but I'll describe it anyway...
I do want to keep a record of what I've seen, and I want the same information maintained in my media manager, J. River Media Center. The link is maintained by the MC plugin PvdImport which necessarily establishes the link between the two databases based on the media filenames. So when I delete a file, it has to be replaced with something that will maintain that link. So what I do is delete the file with a custom Directory Opus macro that creates a null [filename].log file as it deletes the file. Both the PVD and MC file scanners automatically detect and record the change, and PvdImport automatically established the new link and imports the information (MC deletes the original record, so a new one is created).
So I don't think much of the option of removing the file path. I also think that might be a risky practice for others. If files are moved and the file scanner fails to detect the new location, it will delete the path. That would be easy to recover from, but it's the kind of thing that can go unnoticed. A filter would be a better option, but another filter for this situation would be too confusing. So maybe the existing filter can be changed so it's based on the actual existence of a file, rather than the path field being populated.
In the meantime, here's a trick you can use: "Loan" the deleted movie to a borrower named "Deleted," and then use the loan filter to exclude or include deleted movies.